Duduzane, the son of South African President Jacob Zuma (pictured), is a director of the Gupta's Sahara Computers, named after their hometown of Saharanpur, and has been a director of several other Gupta companies

(AFP/File)

Zuma's third wife Bongi Ngema and one of his daughters have also been Gupta employees.

Deputy finance minister Mcebisi Jonas claimed in March that the Guptas had offered him the post of finance minister, providing the first public testimony of their alleged involvement in cabinet appointments.

Last week the BBC reported that little-known ANC lawmaker David van Rooyen visited the Guptas' home the night before his appointment as finance minister in December.

Mines Minister Mosebenzi Zwane is also seen as close to the Guptas.

Both the Guptas and Zuma, who has described the brothers as friends, deny any wrongdoing.

-- WHERE DO THEY LIVE?

Now in their 40s, the Guptas hold court at their residential and business headquarters in a huge high-security compound in Saxonwold, an upmarket district of Johannesburg.

It has a helicopter pad and they reportedly travel with their own chefs and bodyguards.

But as pressure has increased on them this year, they were reported to be moving their base to Dubai and to have bought a large residence in the city.

They said in August that they plan to sell their South African assets.

Public anger towards the family soared in 2013, when a jet carrying 217 foreign guests to a Gupta wedding landed at Waterkloof Air Force base, outside Pretoria.